Reaction tube



FIG. 1 is a front, top, right side perspective view of a reaction tube showing our new design;

FIG. 2 is a rear, bottom and left side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 3.

The broken lines shown in the drawings represent portions of the reaction tube that form no part of the claimed design. 

CLAIM We claim the ornamental design for a reaction tube, as shown and described. 